Grader.



W. PINES.

GRADER.

APPLICATION FILED JAN. 30. 1911.

Patented Dec. 10, 1918.

2 SHEETSSHEET 1.

NITNESSES lNVENTOR ATTORNEY WlTNESSES W. PlNES.

GRADER.

APPUCATION FILED JAN. 30. 19]]- Patented Dec. 10, 1918.

2 SHEETSSHEET 2.

INVENTOR WS'OEEUZCJ,

ATTORNEY 1m.- mums Pyrsi co. rnoimunlm. vusulncram a c.

WILSON PINES, 0F ROGERS, MICHIGAN.

GRADER.

Application filed January 30, 1917.

To all whom it may concern:

Be it known that I, WILSON PINES, a citizen of the United States,residing at Rogers, in the county of Presque Isle and State of Michigan,have invented new and useful Improvements in Graders, of which thefollowing is a specification.

This invention comprehends improvements in graders or screens for stone,ore, coal and like material and has for its pri- ,mary object theprovision of such a machine havin a novelly constructed grading orscreening table over which the material is fed and through which theunder sized particles thereof fall.

Another and more specific object of the invention is to provide a graderor screen having a screening table which includes a plurality oftransverse parallel shafts upon each of which is fixed a plurality ofeccentrically mounted fingers, the fingers of each shaft being disposedat different angles relative to the plane of the table so that they willnot simultaneously engage the material passing thereover.

The invention also aims to generally improve machines of this nature torender them more practical, desirable and efficient.

With these and other objects in view as will become more apparent as thedescription proceeds, the invention consists in certain novel featuresof construction, combination and arrangement of parts as will behereinafter fully described illustrated and claimed.

In the drawings,

Figure 1 is a top plan view of the grader.

Fig. 2 is a side elevation of the grader.

Fig. 3 is an end elevation of the machine.

Fig. 4 is a longitudinal sectional view showing the position of thefingers on the transverse shafts.

Fig. 5 is a fragmentary side elevation showing a modified form ofgearing, and

Fig. 6 is a perspective view of one of the shafts and fingers thereon.

Referring in detail to the drawings by numerals, l and 2 designate theframe legs at the receiving or intake end of the grader and 3 and 4:indicate the frame legs at the discharge of the machine. The legs ineach pair are connected by cross pieces 5 and 6 and by the inclinedbrace bars 7. The legs are connected at their upper ends, to theparallel side bars 8 and 9 which form a part of the grading or screeningtable 9.

Specification of Letters Patent.

Patented Dec. 10, 1918.

Serial No. 145,469.

Extending transversely across the machine are a plurality of shafts 10,11, 12 and 13 which are rotatably mounted in bearings 14 supported onthe bars 8 and 9. Rigidly secured ,to each of the shafts is a pluralityof eccentrically mounted fingers 15 which are arranged at differentangles relative to a horizontal plane. Each of these fingers iselongated having a convex forward edge 16 and a concave rear edge 17.The fingers taper from their butt portions 18 toward their point-edterminals 19 as clearly shown in Fig, 6. Extending between thelongitudinal rows of the eccentric fingers are the partition or divisionbars 20 which are formed with openings for the passage of the transverseshafts and which are connected adjacent their ends to the cross bars 6byuprights or arms 21.

Connected to each of the bars 8 and 9 is a wall 22 which projectsupwardly above the plane of the screening table and which forms part ofthe body of the grader. These walls are inclined downwardly and inwardlyadjacent their lower edges as indicated at 23 to direct material to begraded on to the grading table. At the receiving end of the machinebetween the side walls 22 is mounted a chute 2% having the bottom wall25 and side walls 26. This chute is pivotally connected near its forwardedge to the side walls 22 by means of the fasteners 27 and inclinedrearwardly and downwardly into engagement with the inturned portions ofthe side walls 22. Since the chute is pivotally mounted it may be swungupwardly in an out of the way position to leave the table entirelyuncovered for cleaning purposes.

For rotating the transverse shafts 10, 11, 12 and 13, I provide uponeach of them a fixed sprocket 28 over which passes an endless sprocketchain 29. The forward shaft 10 is equipped with a pulley 30 over whichmay be passed a drive belt to furnish power to the grader.

The transverse shafts may be driven in other ways from that justdescribed and for instance instead of using the sprockets and chain, Imay provide upon each of the shafts a spur gear 31 which meshes with anidler 32. In both forms of transmission mechanism, it will be apparentthat the transverse shafts are all driven in the same direction :so asto cause the eccentrically mounted fingers to advance material along thegrading table. If desired, the rear legs of the grader may be madelonger than the forward legs so as to dispose the screening table at anangle to the horizontal plane with its discharge end elevated above itsreceiving end as shown in the drawings.

In operation, the material to be graded or screened is dumped on to theinclined chute 2e and moves downwardly on tothe screening table where itis acted on by the revolving eccentrically mounted fingers 15. As thetransverse shafts are all driven in the same direction, the fingers Willboth agitate the material and advance such pieces thereof as do not fallthrough the openings. By arranging the fingers of each shaft atdifferent angles relative to the plane of the table they will notsimultaneously engage the material thereof and therefore less power isrequired to operate the machine than would be the case were the fingersdisposed at the same angle to the plane of the table. This is animportant feature of the invention since besides requiring less power tooperate the machine, it makes it possible to construct the various partsof the device of a lighter material than would be the case were all ofthe fingers to simultaneously act upon the material. The eccentricfingers being thus mounted cause the material to be continuouslyagitated as it passes over the screen table whereby it may be thorall ofthe under sized pieces are caused to fall through the screen openings.

While I have shown and described the preferred embodiments of myinvention it will be clearly understood that I do not wish to be limitedto this construction, but may make such changes as will fall within thescope and spirit of the invention as claimed.

lVhat I claim is A grader comprising a support, a series of fixedparallel spaced bars mounted in an inclined position therein and havingtheir upper edges smooth and lying in the same plane, spaced parallelshafts passing through the bars at points between the upper and loweredges thereof, means positively connecting the shafts together forsimultaneous rotation in the same direction, fingers arranged in spiralrows on the shafts and located in the spaces between the bars, saidfingers being curved longitudinally and having end portions which moveabove the upper edges of the bars as they rotate about the axis of theshaft, these fingers being of such length with relation to the distancebetween the adjacent shaft as to provide substantial sifting spaces Whenhorizontal.

In testimony whereof I affix my signature.

WILSON PINES.

Copies of this patent may be obtained for five cents each, by addressingthe "Commissioner of Patents, Washington, D. C.

